Printing hammer device

In a printing hammer device which is disposed on a printing apparatus having a platen and a plurality of character elements, and executes printing by striking one of the character elements, in a printing position, against the platen, said printing hammer device comprising:

• a case member;
• a printing hammer including a striking-side end portion for striking the character elements and a nonstriking-side end portion;
• bearing means for supporting the printing hammer on the case member, in a manner such that the hammer is movable between an initial position and an operative position;
• magnetic drive means for moving the printing hammer in one direction;
• resilient means for returning the printing hammer in the other direction;
• a hammer socket abutting against the nonstriking-side end portion of the printing hammer when the hammer is moved to the initial position;
• shock absorbing means for absorbing the impact of the printing hammer on the hammer socket;
• a resilient supporting member including a pair of peripheral portions which resiliently engage only the shock absorbing means, and a resilient arm which resiliently engages a portion of the hammer socket;
• and
• said shock absorbing means including a ring-shaped inertia member movable in the same direction as the moving direction of the printing hammer, receiving returning energy from the hammer through the hammer socket when the hammer impacts against the hammer socket.

In a printing hammer device which is disposed on a printing apparatus having a platen and a plurality of character elements, and executes printing by striking one of the character elements, in a printing position, against the platen, said printing hammer device comprising:

• a printing hammer movable between an initial position and an operative position, said printing hammer including a striking-side portion for striking the character elements and a nonstriking-side end portion;
• a coil bobbin including a through hole through which said printing hammer is movable along its axial direction, a projected portion projecting from one end of the coil bobbin, a first bearing position formed at a distal end of the projected portion for bearing the striking-side end portion of the printing hammer, and a second bearing portion formed at the other end of the coil bobbin for bearing the nonstriking-side end portion of the printing hammer;
• a coil wound around the coil bobbin;
• a case member made of magnetic material and receiving said coil bobbin, said case member having one end portion provided with an opening and a side portion axially extending along the periphery of the coil from said one end portion, the other end of the case member being open;
• said opening of the case member having a peripheral open edge which is disposed close to said through hole of said coil bobbin;
• a ring-shaped yoke member which is made of magnetic material and is disposed at the other end of said coil bobbin, said yoke member having an outer peripheral edge extending close to the side portion of said case member and an opening in the central portion thereof through which said nonstriking-side end portion of the printing hammer is allowed to pass, said opening of the yoke member being provided with an inner peripheral edge extending close to an outer surface of the nonstriking-side end portion of the printing hammer.
• resilient means for returning the printing hammer to the initial position;
• a hammer socket abutting against the nonstriking-side end portion of the printing hammer when the hammer is moved to the initial position;
• a supporting member for supporting said hammer socket on the case member;
• and
• a magnetic path being formed through said one end and side portions of the case member, said yoke member and said nonstriking-side end portion of the printing hammer upon excitation of the coil, thereby actuating the nonstriking-side end portion of the printing hammer to move toward the one end portion of the case member.